Capacitance humidity sensor

Details Capacitance humidity sensor Capacitance humidity sensor

G - Physics

01

N

G01N 27/22 (2006.01) G01W 1/00 (2006.01)

Patent

CA 2128321

2128321 9316481 PCTABS00025 A capacitance humidity sensor (10) according to the invention has a film core (11) which is in contact with a pair of polymeric conductive layers (12, 13) bonded to opposite faces of the core (11). The core (11) is made of a polymeric material having a dielectric constant which varies substantially linearly with humidity, such as a polyimide or polyparabanic acid. The conductive layers (12, 13) are made of a polymeric material, at least a portion of which includes sulfur atoms in the backbone chain and having conductive particles, such as carbon particles, dispersed therein. Such conductive layers (12, 13) provide superior performance and corrosion resistance in comparison to the metal films employed in the prior art and in comparison to cellulosic polymers containing conductive particles.

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